Make FullscreenElementStack methods private where appropriate

Source/core/dom/FullscreenElementStack.h

Index: Source/core/dom/FullscreenElementStack.h
diff --git a/Source/core/dom/FullscreenElementStack.h b/Source/core/dom/FullscreenElementStack.h
index 46c9d052e066c1a308cd2495606ffa6a1fd068e0..069b65bb003701a7ae8b0e9e4ba63e7b38f5fb25 100644
--- a/Source/core/dom/FullscreenElementStack.h
+++ b/Source/core/dom/FullscreenElementStack.h
@@ -75,12 +75,6 @@ public:
     RenderFullScreen* fullScreenRenderer() const { return m_fullScreenRenderer; }
     void fullScreenRendererDestroyed();
 
-    void clearFullscreenElementStack();
-    void popFullscreenElementStack();
-    void pushFullscreenElementStack(Element&);
-    void addDocumentToFullScreenChangeEventQueue(Document&);
-
-    void fullScreenElementRemoved();
     void removeFullScreenElementOfSubtree(Node*, bool amongChildrenOnly = false);
 
     // W3C API
@@ -105,8 +99,15 @@ private:
     explicit FullscreenElementStack(Document&);
 
     Document* document();
+
+    void clearFullscreenElementStack();
+    void popFullscreenElementStack();
+    void pushFullscreenElementStack(Element&);
+    void addDocumentToFullScreenChangeEventQueue(Document&);
     void fullScreenChangeDelayTimerFired(Timer<FullscreenElementStack>*);
 
+    void fullScreenElementRemoved();
+
     bool m_areKeysEnabledInFullScreen;
     RefPtrWillBeMember<Element> m_fullScreenElement;
     WillBeHeapVector<RefPtrWillBeMember<Element> > m_fullScreenElementStack;